Knife-feeding mechanism for rubber and fabric cutting machines



Aug. 12 19.24.

A W. NICHOLAS '.KNFEl FEDING MECHANISM FOR RUBBER AND FARIC CUTTING MACHINES Filed March EO. 1923 Patented Aug. 12, 1924.

PATENT crema.

VILLIANI NICHOLAS, OF BRIDGEPORT, CONNECTICUT, ASS'IGNOR TO THE BLACK ROCK MFG. CO., OF BRIDGEPORI, CONNECTICUT, A CORPORATIONOFCONNECTCUT.

KNIFE-FEEDNG QMECHANISM FOR RUBBER `.AND FABRIC CUTTING MACHINES.

Application filed March 20, 1923.` Serial No. 626,365.

To @ZZ whom t may concern.'

Be it known that WILLIAM NicHoLAs, a

subject of the King of Great Britain, and resident of Bridgeport, in the county of Fairfield and Stateof Connecticut, has invented certain new and useful Improve.- ments in Knife-Feeding Mechanism for Rubber and Fabric CuttingY Machines, of which the following is afspecication.

The present invention Arelates to` an improved cutting mechanism for rubber ringf and tape cutting machines, and is an improvement in part upon the type of machine shown in an applicationV filed by Hammond butl does not work so well on tubing made upl in part of rolled sheet fabric or materials other than rubber.

The object of the present invention is to provide a knife which is intermittently ro- L tated to bring new cutting surfaces into-po sition independently of the rotation of` the tube-to be cut, and is rotated slightly yduring its movement into engagement' with'the tube, and also during the cutting action, in the same direction of rotation as the tube, see arrow Fig. 1, so'that its cutting surface cuts into the tube in opposed directionlto the: rot-ating movement of thetube, and a more positive and uniform cutting resultsl By this form of cutter l am better ableto cut wound rolls of sheetfabric to produce, as for instance, tapes, binding, gaskets and the like.

A further object is to provide such improvements which will be of simple construction and operation, and which may be incorporated as an attachment with the type of machine disclosed in my copending` application.

With the above and other objects in view,

an embodiment of the invention is shown in the accompanying drawings, and this embodiment will be hereinafter more fully described withV reference thereto, and the invention-v willL be finally pointed out inV the claims.

1n the drawings Fig.I 1 is a vertical sectional view of the type of machine disclosed in thel co-pending joint application of Hammond and Nicholas, andshowingftlie improved cutting mechanism incorporated therein Fig.` 2` is a front viewA of the cutting knife and itsA associated parts, removed from the machine; and

Fig.v 3 is a view partially in section of the cuttingvknife and its supporting bearings.

Similar reference characters indicate correspondingparts throughout the several figures of the drawings.

Referring to the drawings,oand more particularly to Fig. l, thereof, the bed 10 of the machine supports at its ends a forward feed screw shaft 11, and a return feed screw shaft 12, both adapted to be driven by suitable'mechanism, asdisclosed in the coaending-.joint application of Hammond and icholas, and havingV mounted thereon a carriage 13 movable longitudinally of the machine.

AY rocker plate 14; is pivotally mounted upon thecarriage, a spring 15 mounted on a rod 16 yielda-bly holding the'same in engagement with` the contact element 17 of a rocker'lever' 18, pivotally mounted at 19 upon a rotarycollar 20, and having a roller 21 intermediate its ends engaging the cam 22gwhich is adapted to be rotated by the shaft 12.v

The collar 2O is connected to mechanism 23adapted at the end of the feed ofthe carriage to rotate the collar andmove the lever 1S-into inoperative position with relation to the rocker plate 111-. The cam 22 has a-slow rise and a quick drop and is adapted during each; vrotationyto lmove the plate forward slowly andthen returnit quickly to its rearward position.

A knife supporting yoke bracket 24 is adlili) justably mounted Y at 25 on the rocker plate,

and is provided at its ends with adjustable c one-bearings 26 and 27, in which the ends of the knife supporting arbor are rotatably mounted.V

The mandrel 28 upon which the rubber tube is mounted, is adapted to be driven in counter-clockwise direction, as indicated by the arrow, by suitable mechanism as disclosed in said co-pending application.

The circular cutting knife 30 is mounted upon an arbor 31 between a flange 32 formed on the arbor and a collar 33 screwed upon a threaded portion 3401i the arbor, the ends of the arbor being cone-shaped and .rotatably engaging the bearings 26 and 27.

A ratchet 36 is provided on the arbor at one sidev of the knife, its Lhub 57 being iii-:ed to the same by means of a set-screw 38 engaging one of the flats 39 provided at each end thereof.` 'Ihe'set-screw also secures a retainingv collar 40, behind which there. is rotatably mounted upon the hub a lever 41k carrying ya pawl 42, pivoted upon a pin 43 and held yieldably in engagement with the ratchet by means of a spring 44.

A connecting rod 45 is pivotally connected at one end to a pin 46 provided on the lever 41,. and pivotally connected at its other end to the Vforked end 47 offa screw 48, adjustably secured by nuts 49 to a clamp 50, en-

gaged uponthe post 5l of the carriage.

This post supports a lubricant pipe 52 designed torfeed water or other lubricant to the cutter.

In operation, the forward feed of the knife through the action of the cam 22 causes the lever 4l to be rotated on the arbor, and throughengagement of the pawl with the ratchet the knife is rotated through a partial revolution during the forward feed, in

kthe direction of the arrow, so that it positively cuts into the surface of the rubber tube in opposed direction to its rotation, and continues this opposed movement as it cuts through the tube. During the rearward movement of the knife the pawl rides over the ratchet to engage another, tooth so that upon the next' forward movement a new cutting surface is brought into action. The cuttingof the rubber rings is positive and uniform, and the life of the knife is very considerably increased.

I have illustrated a preferred andsatisfactory embodiment of the invention, but it isV obvious that changes may be made therein, within the spirit and scope thereof, as defined inthe appended claims.

Having thus describedmy invention, what I claim and desire to secure by Letters Patent is i l. In a machine of the character described, a rotatable tube supporting mandrel, a circular cutting knife. means adapted to impart inward and outward movement to the knlie to engage and disengage it with the tube, and means adapted to iiiterniittently rotate said knife during its inward movement through a partial revolution inde]iendentl); of the rotation of the tube.

2. In a machine of the elmrarler described. a rotatable tube supporting mandrel. a rircular cutting knife. means adapted lo iinpa ri inward and outward movement to the knife to engage and disengagre it with the tube. and means adaoted to intermittently rotate said knife du ing its inward movement through a Vpart revolution iu the same direction of rotation as the mandrel.

3. In a machine of the churruter described,

a rotatable tube supporting mandrel.r u eircular cutting knife, means adapted to impart inward and outward movement, to the knife to engage and disengage it with the tube. and ratchet mechanism adapted to rotate said knife through a partial revolution dur` ing its inward movement.

- 4. In a machine of the cha raeter described. a rotatable tube supporting mandrel, a circular cutting knife, means adapted to impart inward and outward movement to the knife to engage and disengage it with the tube` a ratchet .fixed with relation to the knife, a rotary pawl carrier having a pawl engaging said ratchet, and means whereby forward movement of the knife causes the pawl and ratchet to rotate the knife through a partial revolution. Y

v5. In a machine of the character described, a rotatable tube supporting mandrel, a car-- riage, a knife support mounted on said carriage, a knife adjustably mounted on said support, means adapted to actuate said support to move the knife into and out of engagement with the tube, a ratchet. fixed with relation to said knife, a rotary paw]A carrier having `a pawl engaging said ratchet, and adjustable means connecting said pawl carrier to said carriage, wherebyv forward movement of the knife causes the pawl and ratchet to' rotate the knife through a partial revolution.

Signed at Bridgeport, in the county of Fairfield and State of Connecticut this 17th day of March, A. D., 1923.

' IVILLIAM NICHOLAS.

itnessesz GUY L. HAMMOND, MARY E. CULLEN. 

